redirect.admin.class.php

<?php
require_once 'redirect.class.php';
/**
 * ----------------------------------------------------------------------
 *   _____ __  __ _        _____          _ _               _   
 *  |_   _|  \/  | |      |  __ \        | (_)             | |  
 *    | | | \  / | |      | |__) |___  __| |_ _ __ ___  ___| |_ 
 *    | | | |\/| | |      |  _  // _ \/ _` | | '__/ _ \/ __| __|
 *   _| |_| |  | | |____  | | \ \  __/ (_| | | | |  __/ (__| |_ 
 *  |_____|_|  |_|______| |_|  \_\___|\__,_|_|_|  \___|\___|\__|
 *
 * ----------------------------------------------------------------------
 * Loads a config json from outside webroot and makes a 3xx redirect
 * if the definition exists
 * ----------------------------------------------------------------------
 * 2020-05-11  v1.4  ah  rewrite as class
 * 2022-02-03  v1.5  ah  add method isEnabled
 * 2022-05-23  v1.6  ah  add http head check+render output; 
 * 2022-05-31  v1.7  ah  optical changes
 */

/**
 * Description of redirect
 *
 * @author axel
 */
class redirectadmin extends redirect {

    protected function _getCurlOptions(){
        $aReturn=array(
            CURLOPT_HEADER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_USERAGENT => strip_tags($this->sAbout),
            CURLOPT_VERBOSE => false,
            CURLOPT_ENCODING => 'gzip, deflate',  // to fetch encoding
            CURLOPT_HTTPHEADER => array(
                'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                'Accept-Language: en',
                'DNT: 1',
            ),

            // TODO: this is unsafe .. better: let the user configure it
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_TIMEOUT => 5,
        );
        return $aReturn;
    }

    /**
     * make a single http(s) get request and return the response body
     * @param string   $url          url to fetch
     * @param boolean  $bHeaderOnly  optional: true=make HEAD request; default: false (=GET)
     * @return string
     */
    public function httpGet($url, $bHeaderOnly = false) {
        $ch = curl_init($url);
        foreach ($this->_getCurlOptions() as $sCurlOption=>$sCurlValue){
            curl_setopt($ch, $sCurlOption, $sCurlValue);
        }
        if ($bHeaderOnly) {
            curl_setopt($ch, CURLOPT_HEADER, 1);
            curl_setopt($ch, CURLOPT_NOBODY, 1);
        }
        $res = curl_exec($ch);
        curl_close($ch);
        return ($res);
    }